This study was conducted as a part of the project to establish professional development system(PDS) for teachers in Korea. This study aimed to provide a case of running a professional learning community(PLC) of teachers in science education based on the collaboration of a national university of education and its affiliated elementary school, in search of learning by participants and implications for professional development of teachers as well as for science teaching in elementary schools. Teachers and researchers who participated in the PLC were able to accumulate meaningful experiences through 11 rounds of meetings. It was not easy to secure enough time for meetings, but they were able to boost their self-confidence for science teaching and enhance the quality of lessons through these gatherings. Participating teachers had a chance to share instructional design, planning, strategies and practices, which include cases of guiding free-choice research activities among students, thereby to be motivated for improved science teaching for the future. The researcher participating in this PLC was also able to understand the identity of an elementary school, especially the affiliated school, and identify the reality and difficulties related to science teaching in schools. Experiences of participating in PLC are expected to help improve the quality of science teaching in affiliated elementary school and pre-service teacher education of the university.